Global Patent Index - EP 1058365 A2

EP 1058365 A2 2000-12-06 - Electronic trip unit with user-adjustable sensitivity to current spikes

Title (en)

Electronic trip unit with user-adjustable sensitivity to current spikes

Title (de)

Elektronische Auslöseeinheit mit vom Anwender einstellbarer Empfindlichkeit

Title (fr)

Unité de déclenchement électronique à sensibilité ajustable par l'utilisateur

Publication

EP 1058365 A2 (EN)

Application

EP 00304600 A

Priority

US 32560599 A

Abstract (en)

A circuit breaker trip unit with user-adjustable sensitivity to current spikes (22) includes a user-adjustable switch (30), a current sensor (32), an analog-to-digital (A/D) converter (34), a microprocessor (36), and a power supply (37). The current sensor (32) is electrically connected to the distribution circuit (10) and provides analog signals indicative of current measurements in the distribution circuit (10) to the A/D converter (34). The A/D converter (34) converts the analog signal to a digital line signal and presents the digital line signal, via a bus (38), to the microprocessor (36). The user-adjustable switch (30) is arranged to provide a signal indicative of a limit value, via a bus (40), to the microprocessor (36). The microprocessor (36) comprises a plurality of registers (42-48) and ROM (50) internal thereto. The ROM (50) includes trip unit application code, e.g., main functionality firmware, including initializing parameters, boot code, and a short circuit protection algorithm. The short circuit protection algorithm compares the line signal stored in the threshold register (48) to a predetermined threshold value stored in the ROM (50). If the line signal exceeds the threshold value, the microprocessor increments a peak count value stored in the peak count register (42). When the peak count reaches the limit value stored in the peak count register (42), a trip signal is generated by the microprocessor (36). <IMAGE>

IPC 1-7 (main, further and additional classification)

H02H 1/04; H02H 3/44

IPC 8 full level (invention and additional information)

H02H 3/093 (2006.01); H01H 83/02 (2006.01); H02H 1/04 (2006.01); H02H 3/02 (2006.01); H02H 3/44 (2006.01); H02H 3/08 (2006.01)

CPC (invention and additional information)

H02H 3/44 (2013.01); H02H 1/04 (2013.01); H02H 3/08 (2013.01)

Citation (applicant)

Designated contracting state (EPC)

BE DE ES FR GB IT

EPO simple patent family

EP 1058365 A2 20001206; EP 1058365 A3 20030423; EP 1058365 B1 20091021; CN 100511906 C 20090708; CN 100539343 C 20090909; CN 1276640 A 20001213; CN 1855656 A 20061101; DE 60043176 D1 20091203; HU 0002040 A2 20010228; HU 0002040 A3 20030728; HU 0002040 D0 20000828; JP 2001016761 A 20010119; MX PA00005504 A 20020308; TW 512566 B 20021201; US 2001033470 A1 20011025; US 6262872 B1 20010717; US 6400543 B2 20020604

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